I've put up to 12 36 shot rolls through 1 batch. The instructions say up to 18 rolls, but you have to increase times. I don't have the instructions that show the time multiplier any more. You can download them from Tetenal. 1 liter made 10 liters when I diluted at 1:9, although they only have 1:4 and 1:6 listed.
Hope this helps!